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@ 2014-06-12T17:10:24Z

<?php

$string = 'HDO Intranet — Futar.png';

$encoded = htmlentities($string);

$result = $encoded;
$result = preg_replace('/[^a-zA-Z\d\s-_\.]/', '', $result);

echo $result;

Output
Performance
VLD
References
Branches

htmlentities: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

50.5 ms | 402 KiB | 5 Q